Supporting means for a mobile percussive rock drill for carrying out cylindrical cuts

ABSTRACT

A percussive type rock drill is in the course of carrying out substantially horizontal holes for a cylindrical cut in the rock face supported by a support, which is suspended by means of suspension heads on both extremities of said support in cutouts of guiding grooves of a stable pattern fixed on the rock face and of an adjustable pattern mounted on a mounting pillar. Holes for the drill bit of the rock drill are provided above each cutout of said guiding grooves.

I Un ted States Patent 1 1 3,559,750

[72] lnvcntor Vladimir Mares [50] Field of Search 173/32, 33, Pribram,Czechoslovakia 45 [21} Appl. No, 832,923 {22] Filed June 13, 1969References C1tcd [45] Patented Feb. 2, 1971 UNITED STATES PATENTS I 1Assignee w y l pwmysl 639,267 12/1899 Moss 173/32x gefleralm redltelsm2,969,121 1/1961 Wallace... 173/33 Prlbram, Czechoslovak! 3,007,686 11/196] Pearson... 173/32x [32] Priority June 19, 1968 [33]Czechoslovakia Pnmary Exammer-Emest R. Purser 3 pv4509 A ttorney Arthur0. Klein [54] SUPPORTING MEANS FOR A MOBILE ABSTRACT: A percussive typerock drill is in the course of PERCUSSIVE ROCK DRILL FOR CARRYING OUTcarrying out substantially horizontal holes for a cylindrical cutCYLINDRICAL CUTS in the rock face supported by a support, which issuspended by 2 Chin, 5 Drawing Figs means of suspension heads on bothextremities of said support in cutouts of guiding grooves of a stablepattern fixed on the [52] US. Cl 173/33, rock face and of an adjustablepattern mounted on a mounting l73/45 pillar. Holes for the drill bit ofthe rock drill are provided [51 Int. Cl E2lc 11/00 above each cutout ofsaid guiding grooves.

lI-I' PATENTED FEB 2 m1 SHEET 2 [1F 2 INVENTOR: V/adim/Y MHRES ATTORNEYSUPPORTING MEANS FOR A MOBILE PERCUSSIVE ROCK DRILL FOR CARRYING OUTCYLINDRICAL CUTS BACKGROUND OF THE INVENTION This invention relates to amobile percussive-type rock drill for carrying out cylindrical rock cutsof the kind, where for the guiding of the hammer drill performing areciprocating movement along a support, a pattern is used for exactlocating of the holes of the rock cut.

Actually used percussive-type rock drills with guiding patterns of sheetiron enable to anchor said pattern by using a prior drilled centralhole, locating thus the remaining holes. Similar arrangements can beused for manual control of the operation only, whereby drilling oflarger holes is rather troublesome.

SUMMARY OF THE INVENTION The subject invention is directed toimprovements of supporting and guide means of similar percussive rockdrills which would enable to drill a number of exactly parallel holesfor a rock cut.

It is another object of this invention to enable an exact mechanicaldrilling by means of a power driven too], where the only manual workwould be the adjustment of the tool for drilling a subsequent hole.

Other objects and advantages will appear from the following descriptionof an example of the invention, when considered in connection with theaccompanying drawings, and the novel features will be particularlypointed out in the appended claims.

DESCRIPTION OF THE DRAWINGS FIG. 1 is an elevation of a percussive rockdrill in partial longitudinal section as applied at the rock face,

FIG. 2 is a frontal elevational view of a stable drill pattern, saidview taken in direction of the arrow a in FIG. 1,

FIG. 3 is a similar view of another drill pattern arranged on theopposite end of the drill support, said view taken in direction of thearrow b in FIG. 1,

FIG. 4 is a more detailed view showing in partial section the suspensionof the suspension head of the drill support in the stable pattern,

FIG. 5 is a frontal elevation of a part of the stable pattern withoutthe support.

DESCRIPTION OF PREFERRED EMBODIMENT Referring to FIGS. 1, 2 and 3 of thedrawings in percussive rock drill comprises a substantially horizontalsupport I, supporting and guiding a reciprocating hammer drill 2 ofcommon design and actuated by any of known driving means generating areciprocating movement. The support I is provided on its bothextremities with suspension heads 5 and 6 represented for instance bybolts with enlarged heads on their free ends. Said suspension heads areadapted to be suspended in a manner which will be described later, intwo oppositely arranged patterns 3 and 4. The pattern 3 made forinstance of reinforced sheet iron is anchored in the rock face 7 bymeans of two anchoring bolts 8 and is secured against turning by twoadjustable rests 9. The opposite pattern 4 is supported by an adjustablemounting pillar 10 provided with a number of openings II for a settingbolt 12. The pattern 4 is secured on the mounting pillar 10 by means ofa bracket 40, to which it is fastened by a wing nut 13 at each side ofthe vertical plane of symmetry.

The stable pattern 3 is provided with a number of circular holes 14distributed according to the required position or the bore holes of therock cut and in addition with a guiding slot 15, provided with cutoutsI6 inthe horizontal branches of said guiding slot 15, which has in theexemplary embodiment approximately the shape of the letter 2. Thesecutouts 16 are situated always below each circular hole I4. At bothextremities of the guiding slot 15 are circular holes 17 for insertingand removal of the suspensions head 5 of the support I of the hammerdrill 2.

The oppositely arranged pattern 4, the height of which is adjustable,has a similar guiding slot I8 as the pattern 3, which guiding slot 18 isa mirror image of the slot I5 of said pattern 3. Similar cutouts I9corresponding to cutouts I6 of the slot 15 of pattern 3 are providedalong the guiding slot 18 and equally circular holes 20 for insertingand removal of the suspension head 6 of the support of the hammer drill2.

The drill steel 21 of the reciprocating hammer drill 2 has on its freeextremity a drill bit 22, the external diameter of which is somewhatsmaller than the internal diameter of sleeves 24 mounted firmly in thecircular holes 14. The drill steel 21 is guided in said sleeves 24 bymeans of a bushing 23. In FIG. 2 both the bushing 23 and sleeves 24 arenot shown, they can be however seen in FIG. 4 and 5.

The circular holes l7 and 20 of both patterns 3 and 4 have a somewhatlarger diameter than the width of the guiding slots 15, I6 serving forsuspension and safe guidance of the suspension heads 5 and 6 of thesupport 1 of the hammer drill 2.

FIGS. 4 and 5 show in more detail the suspension of the suspension head5 in the stable pattern 3 and the guiding of the drill steel 21 with thedrill bit 22. The sleeve 24 is fixed to the pattern 3 by welding, thebushing 23 is provided with a longitudinal cut of a width surpassing thediameter of the drill steel 21 and with a handle 26 for manipulation.

The described structure operates as follows: Two short parallel boreholes for anchoring the anchoring bolts 8 are first drilled in the rockface. The stable pattern 3 is fixed to said bolts 8 and its position issecured against turning by the adjustable rests 9. The suspension head 5of the support I of the hammer drill 2 is thereafter inserted into thecircular hole I7 of pattern 3 and shifted manually in the guiding slot15 up to the first cutout 16. The suspension head 6 at the oppositeextremity of the support 1 is in a similar manner suspended in thesecond pattern 4 by inserting into the circular hole 20 and by shiftingto the first cutout 19 of the guiding slot 18. The vertical and lateralposition of the pattern 4 is thereafter adjusted by adjustment of theposition and height of the mounting pillar I0 so as to coincide exactlyand correctly with the position of the pattern 3. The hammer drill 2 isthereafter brought to operation to start drilling of the first bore hole25, whereafter after there is sufficient guidance for the drill bit 22the bushing 23 is retracted and removed and the boring of the hole 25continued. When the boring of this hole 25 is finished the drill steel21 with the drill bit 22 comes beyond the sleeve 24 of the hole 14 andthe support I with the hammer drill 2 is manually shifted in the guidingslots 15 and 18 of both patterns 3 and 4 to the following cutout toproceed with boring of the next bore hole 25 until all required boreholes are finished.

It can be understood from the above said, that the required bore holesfor the rock cut are bored mechanically and the only manual work of theattendant is the manual shifting of the support 1 of the hammer drill 2with the drill steel 21 from one cutout I6 and 19 of both patterns 3 and4 to the next ones while maintaining an exactly parallel position of allbore holes even if said bore holes are very close together, say atdistances of only four inches.

It is to be understood that the shape of the patterns 3 and 4 are chosenin accordance with the required distribution of bore holes of therespective rock cut.

So far the rock cut has been designated as cylindrical rock out itshould be understood that rock cuts of any shape are ineluded by thisterm so far the direction of all holes for this cut remain parallel, indifference to conical rock cuts.

I claim:

I. Supporting means for a mobile percussive rock drill for carrying outrock cuts comprising in combination:

a stable pattern of the shape of a vertical sheet provided with meansfor fixing on the rock face;

a second pattern provided with means for fixing on an adjustablemounting pillar;

said support provided with suspension heads at both extremities forsuspension in the cutouts of the guiding slots.

2. Supporting means for a mobile percussive rock drill as claimed inclaim I with inserting holes provided at least at both extremities ofsaid guiding slots for inserting and removal of the suspension heads ofsaid support of the rock drill into and from said guiding slots.

1. Supporting means for a mobile percussive rock drill for carrying outrock cuts comprising in combination: a stable pattern of the shape of avertical sheet provided with means for fixing on the rock face; a secondpattern provided with means for fixing on an adjustable mounting pillar;said stable pattern provided with circular holes at places where boreholes for the rock cut are required; a continuous guiding slot in bothsaid patterns at equal distance below the centers of said circularholes; cutouts along said slot in both patterns at places correspondingto places below each of said circular holes, of said stable pattern; asupport for the percussive rock drill; and said support provided withsuspension heads at both extremities for suspension in the cutouts ofthe guiding slots.
 2. Supporting means for a mobile percussive rockdrill as claimed in claim 1 with inserting holes provided at least atboth extremities of said guiding slots for inserting and removal of thesuspension heads of said support of the rock drill into and from saidguiding slots.